Rocket Vent Hole Size Calculator: Difference between revisions
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{{Docnav |
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|[[Rocket_Thrust_To_Weight_Calculator|Thrust To Weight Calculator]] |
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|[[Base_PreviousCommand|PreviousCommand]] |
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|[[Rocket_Workbench|Rocket Workbench]] |
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|IconL=Rocket_Calculator.svg |
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|IconL= <!--filename of icon with extension (e.g. svg, png)--> |
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{{GuiCommand |
{{GuiCommand |
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|Name=Rocket Vent Hole Size Calculator |
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|Name=Bulkhead |
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|Icon= |
|Icon=Rocket_Calculator.svg |
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|MenuLocation=Rocket → |
|MenuLocation=Rocket → Calculators → Vent Hole Size Calculator |
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|Workbenches=[[Rocket_Workbench|Rocket Workbench]] |
|Workbenches=[[Rocket_Workbench|Rocket Workbench]] |
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|SeeAlso= <!--add links to similar commands; delete this row if not used--> |
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|Version=0.19 |
|Version=0.19 |
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== Description == |
== Description == <!--T:3--> |
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A bulkhead is a solid section of material used to close off a section of body tube, or to provide a base for a nose cone. |
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This calculator determines the minimum size of vent holes for barometric altimeters based on the volume of the space and the number of vent holes. |
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== Usage == |
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Calculation comes from the rule of thumb of 1/4" vent hole for every 100 cubic inches of volume. A single vent hole of the appropriate size is susceptible to noise caused by breezes and wind gusts. These effects are minimized by using multiple vent holes distributed around the volume, with 3 holes being considered a practical minimum. The combined area of all vent holes will be equivalent to that of a single larger hole. |
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== Usage == <!--T:6--> |
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# There are several ways to invoke the command: |
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#* Press the {{Button|[[Image:Rocket Bulkhead.svg|16px]] [[Rocket_Bulkhead|Bulkhead]]}} button. |
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#* Select the {{MenuCommand|Rocket → [[Image:Rocket Bulkhead.svg|16px]] Bulkhead}} option from the menu. |
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#* Double click on a Bulkhead object in the model view. |
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# Set options and press {{Button|OK}}. |
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== Options == |
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[[File:Calc_vent_hole_size.png]] |
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<translate> |
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* Optional. List the command options here. Check out two examples, {{Button|[[Image:Draft_Line.svg|16px]] [[Draft_Line|Draft Line]]}} and {{Button|[[Image:PartDesign_Pad.svg|16px]] [[PartDesign_Pad|PartDesign Pad]]}}. |
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# There are several ways to invoke the command: |
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#* Press the {{Button|[[Image:Rocket_Calculator.svg|16px]] [[Rocket_Vent_Hole_Size_Calculator|Vent Hole Size Calculator]]}} button. |
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#* Select the {{MenuCommand|Rocket → Calculators → [[Image:Rocket_Calculator.svg|16px]] Vent Hole Size Calculator}} option from the menu. |
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# Enter the parameters of your electronics bay. |
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== |
== Calculation == <!--T:8--> |
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Optional. |
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Vent hole size is calculated using the following formula: |
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== Notes == |
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::<math>D_{vent} = 0.004396 D \sqrt{\cfrac{L}{N}}</math> |
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* Optional. Use a bullet list if there are multiple items. You can also mention limitations here. |
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where |
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== Properties == |
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::<math>D_{vent} = </math> vent hole size |
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::<math>D = </math> body tube diameter |
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::<math>L = </math> body tube length |
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::<math>N = </math> number of vent holes |
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=== |
=== Units === <!--T:13--> |
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{{TitleProperty|Property Group}} |
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Calculations are done using metric units, but will display in your preferred units. Values can also be entered using any supported units by including the units with the value (''eg'' 5 oz, or 23.2 g) |
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* {{PropertyData|Property Name 1}}: Description of the property |
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=== View === |
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{{TitleProperty|Property Group}} |
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* {{PropertyView|Property Name 2}}: Description of the property |
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== Scripting == |
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See also: [[:Category:API]] and [[FreeCAD_Scripting_Basics|FreeCAD Scripting Basics]]. |
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The ExampleCommandModel tool can be used in [[Macros|macros]] and from the [[Python|Python]] console by using the following function: |
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{{Code|code= |
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Object = makeExampleCommandModel(Data1, Data2) |
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}} |
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* Creates an {{incode|Object}} using {{incode|Data1}} and {{incode|Data2}}. |
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Example: |
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{{Code|code= |
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import FreeCAD, Base |
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Model = Base.makeExampleCommandModel(FreeCAD.Data1, FreeCAD.Data2) |
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}} |
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<translate> |
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== |
== References == <!--T:15--> |
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<!--T:16--> |
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Optional. |
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# http://vernk.com/AltimeterPortSizing.htm |
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{{Docnav |
{{Docnav |
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|[[Rocket_Thrust_To_Weight_Calculator|Thrust To Weight Calculator]] |
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|[[Base_PreviousCommand|PreviousCommand]] |
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|[[Rocket_Workbench|Rocket Workbench]] |
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|IconL=Rocket_Calculator.svg |
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|IconL= <!--filename of icon with extension (e.g. svg, png)--> |
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|IconR= <!--filename of icon with extension (e.g. svg, png)--> |
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|IconC=RocketWorkbench.svg |
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|IconC= <!--filename of icon with extension (e.g. svg, png)--> |
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}} |
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{{Workbench Tools navi{{#translation:}}}} <!--use the Tools navi belonging to the workbench --> |
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[[Category:Addons{{#translation:}}]] |
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[[Category:External Workbenches{{#translation:}}]] |
Latest revision as of 08:54, 18 March 2021
Rocket Vent Hole Size Calculator |
Menu location |
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Rocket → Calculators → Vent Hole Size Calculator |
Workbenches |
Rocket Workbench |
Default shortcut |
None |
Introduced in version |
0.19 |
See also |
None |
Description
This calculator determines the minimum size of vent holes for barometric altimeters based on the volume of the space and the number of vent holes.
Calculation comes from the rule of thumb of 1/4" vent hole for every 100 cubic inches of volume. A single vent hole of the appropriate size is susceptible to noise caused by breezes and wind gusts. These effects are minimized by using multiple vent holes distributed around the volume, with 3 holes being considered a practical minimum. The combined area of all vent holes will be equivalent to that of a single larger hole.
Usage
- There are several ways to invoke the command:
- Press the Vent Hole Size Calculator button.
- Select the Rocket → Calculators → Vent Hole Size Calculator option from the menu.
- Enter the parameters of your electronics bay.
Calculation
Vent hole size is calculated using the following formula:
where
- vent hole size
- body tube diameter
- body tube length
- number of vent holes
Units
Calculations are done using metric units, but will display in your preferred units. Values can also be entered using any supported units by including the units with the value (eg 5 oz, or 23.2 g)
References
- Getting started
- Installation: Download, Windows, Linux, Mac, Additional components, Docker, AppImage, Ubuntu Snap
- Basics: About FreeCAD, Interface, Mouse navigation, Selection methods, Object name, Preferences, Workbenches, Document structure, Properties, Help FreeCAD, Donate
- Help: Tutorials, Video tutorials
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- Hubs: User hub, Power users hub, Developer hub